13820539 has 4 divisors (see below), whose sum is σ = 14421456. Its totient is φ = 13219624.

The previous prime is 13820531. The next prime is 13820551. The reversal of 13820539 is 93502831.

It is a happy number.

13820539 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93502831 = 163 ⋅573637.

It is a cyclic number.

It is not a de Polignac number, because 13820539 - 2³ = 13820531 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13820539.

It is not an unprimeable number, because it can be changed into a prime (13820531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300424 + ... + 300469.

It is an arithmetic number, because the mean of its divisors is an integer number (3605364).

Almost surely, 2^13820539 is an apocalyptic number.

13820539 is a deficient number, since it is larger than the sum of its proper divisors (600917).

13820539 is an equidigital number, since it uses as much as digits as its factorization.

13820539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600916.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 13820539 is about 3717.5985528295. The cubic root of 13820539 is about 239.9799693931.

It can be divided in two parts, 138 and 20539, that multiplied together give a palindrome (2834382).

The spelling of 13820539 in words is "thirteen million, eight hundred twenty thousand, five hundred thirty-nine".